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相关概念视频

Secondary Active Transport01:55

Secondary Active Transport

122.9K
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
122.9K
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

14.5K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
14.5K
Phloem and Sugar Transport02:02

Phloem and Sugar Transport

28.6K
Like many living organisms, plants have tissues that specialize in specific plant functions. For example, shoots are well adapted to rapid growth, while roots are structured to acquire resources efficiently. However, sugar production is primarily restricted to the photosynthetic cells that reside in the leaves of angiosperm plants. Sugar and other resources are transported from photosynthetic tissues to other specialized tissues by a process called translocation.
28.6K
Secondary Active Transport01:32

Secondary Active Transport

12.8K
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
12.8K
Transcellular Transport of Solutes01:23

Transcellular Transport of Solutes

4.0K
Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
4.0K
Glucose Transporters01:27

Glucose Transporters

15.2K
Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
15.2K

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Transverse Sectioning of Mature Rice Oryza sativa L. Kernels for Scanning Electron Microscopy Imaging Using Pipette Tips as Immobilization Support
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Transverse Sectioning of Mature Rice Oryza sativa L. Kernels for Scanning Electron Microscopy Imaging Using Pipette Tips as Immobilization Support

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在大米中的一个运输器.

Jian Feng Ma1, Kazunori Tamai, Naoki Yamaji

  • 1Research Institute for Bioresources, Okayama University, Chuo 2-20-1, Kurashiki 710-0046, Japan. maj@rib.okayama-u.ac.jp

Nature
|March 31, 2006
PubMed
概括

研究人员确定了低米1 (Lsi1) 基因,该基因对大米植物的吸收至关重要. 这一发现为开发具有对各种环境压力的增强抵抗力的作物提供了新的策略.

科学领域:

  • 植物生物学 植物生物学
  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.

背景情况:

  • 有利于植物生长和抗压力.
  • 对于可持续的水生产至关重要.
  • 植物吸收的分子机制仍然是未知的.

研究的目的:

  • 为了确定负责大米中积累的基因.
  • 为了阐明植物吸收的分子机制.

主要方法:

  • 基因鉴定和表征 (Lsi1).
  • 在大米根中的基因表达分析.
  • 使用Xenopus卵细胞进行功能分析.

主要成果:

  • 低米1 (Lsi1) 基因控制了大米中的积累.
  • Lsi1是一种水素素家族基因,在米根中构成性表达.
  • Lsi1定位在根细胞的血膜上,并促进了的运输.

结论:

  • Lsi1是大米中的转运器.
  • 了解Lsi1提供了关于植物吸收的见解.

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  • 修改Lsi1提供了一种策略,用于设计抗压作物.